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首页> 外文期刊>Climatic Change >Management strategies to sequester carbon in agricultural soils and to mitigate greenhouse gas emissions.
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Management strategies to sequester carbon in agricultural soils and to mitigate greenhouse gas emissions.

机译：隔离农业土壤中的碳并减少温室气体排放的管理策略。

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Carbon sequestration in agricultural soils is frequently promoted as a practical solution for slowing down the rate of increase of CO2 in the atmosphere. Consequently, there is a need to improve our understanding of how land management practices may affect the net removal of greenhouse gases (GHG) from the atmosphere. In this paper we examine the role of agriculture in influencing the GHG budget and briefly discuss the potential for carbon mitigation by agriculture. We also examine the opportunities that exist for increasing soil C sequestration using management practices such as reduced tillage, reduced frequency of summer fallowing, introduction of forage crops into crop rotations, conversion of cropland to grassland and nutrient addition via fertilization. In order to provide information on the impact of such management practices on the net GHG budget we ran simulations using CENTURY (a C model) and DNDC (a N model) for five locations across Canada, for a 30-yr time period. These simulations provide information on the potential trade-off between C sequestration and increased N2O emissions. Our model output suggests that conversion of cropland to grassland will result in the largest reduction in net GHG emissions, while nutrient additions via fertilizers will result in a small increase in GHG emissions. Simulations with the CENTURY model also indicated that favorable growing conditions during the last 15 yr could account for an increase of 6% in the soil C at a site in Lethbridge, Alberta. Presented at the International Workshop on Reducing Vulnerability of Agriculture and Forestry to Climate Variability and Climate Change, Ljubljana, Slovenia, 7-9 October 2002..
机译：农业土壤中的碳固存经常被提倡作为减缓大气中CO2增长速度的实用解决方案。因此，有必要增进我们对土地管理实践如何影响大气中温室气体净清除量的理解。在本文中，我们研究了农业在影响温室气体预算中的作用，并简要讨论了农业减少碳排放的潜力。我们还研究了通过减少耕作，减少夏季休耕的频率，将草料作物引入轮作，将农田转化为草地以及通过施肥增加养分等管理措施来增加土壤固碳的机会。为了提供有关此类管理措施对温室气体净预算的影响的信息，我们使用CENTURY（C模型）和DNDC（N模型）在加拿大的五个地区进行了30年的模拟。这些模拟提供了有关固碳和增加N2O排放量之间潜在权衡的信息。我们的模型输出表明，退耕还林将最大程度减少温室气体净排放量，而通过肥料添加养分将导致温室气体排放量略有增加。用CENTURY模型进行的模拟还表明，过去15年中有利的生长条件可能导致艾伯塔省莱斯布里奇（Lethbridge）某处土壤C的增加6％。于2002年10月7日至9日在斯洛文尼亚卢布尔雅那举行的“减少农业和林业对气候变化和气候变化的脆弱性国际研讨会”上发表。

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